pdf 502-541-406NW Add IA Sep70 - 564HD Service Mod C4A To H1A Ocr Popular
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502-541-406NW_Add_iASep70_564HD_Service_Mod_C4A_to_H1A_ocr.pdf
Addendum issue 1, September 1970. Change C4A ringer to H1A to permit mounting two buzzers. Contributed by John Novack.
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